Adapter block



FIG. 1 is a top-front isometric view of an adapter block showing the new design;

FIG. 2 is a bottom-rear isometric view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines show portion of the adapter block that form no part of the claimed design. 

CLAIM The ornamental design for an adapter block, as shown and described. 